This is an interesting mug with exterior building surface. A coffee mug and construction set all in one! Drinking coffee while building something is really a wonderful thing. Features: Material: food grade nontoxic plastic A cup comes with a bag of accessories (3-4 blocks ramdon). There are standard interfaces on cup's body and handle. You simply choose blocks that you like, stand them on it and create the unique mug cup. This cup is compatible with LEGO, Pixel Blocks, Mega Blokes, KRE-O and K'NEX, etc. buliding blocks. Capacity: about 350 ml Including: 1 x Coffee Mugs Note: This product can withstand 100 degrees centigrade, but can not be put in microwave and dishwasher. Please wash it by hand!